Chuck



July 1927- A. EDELMANN cnucx Filed Oct. 4. 1922 INVENTOR b0uisA.EdelIna/ul ATTORNEY Patented July 5,

UNITED PATENT OFFICE.

LOUISA. EDELMANN, on ST, Lotus, MIssounI, lasers-Nora TO Tat oooron PRODUCTS conron-A'rron, or sr. Louis, MISSOURI, a eonroancrron or Mrsso ar.

CHUCK.

p iqi filedflc i 1 22- cI aINQ- 592,307.

Thi nv nti n, re ates g ner l y to WOrkholding devices and,,more particularly, to a certain new and'useful, improvement in worlrholding devices of the class commonly new as he The principal object'of my present inven may be readily installed upon the turningor other machine, which may be conveniently econ mically repaired and its parts replaced or renewed when necessary or re quired through wear, breakage, or other cause, and which is actuatable with ease, rapidity, and precision.

, With the, above and also other objects in view my present invention resides in the novel features of form, construction, arrangement, and combination of parts hereinafter described and afterwards pointed out in the claims In the accompanying drawings,.

Figure 1 is a longitudinal sectional view of av chuck embodying my inventiomsomev of thejaws being omitted and their engaging ring being broken away, and

Figure 2 is, a transverse sectional view of the chuck on approximately the line 2?2, Figure 1,, i

Referring now more in detail and by reference characters to the accompanying drawings, which illustratesapreferred embodiment of my invention, 1 indicates the body of the devicegvhich is preferably in the form of a tubular steel cylinder of suitable diameter,

having at its inner ends a threaded connection 2 with SQTCELHQCI- adapter 3 bored and internally threaded, as at 4, whereby the chuck may be conveniently attached, to and upon the turning machine, as will be understood. Disposed within and preferably integral with body 1 is a wall 5 having an axial forwardly extending and preferably r d. ext n i n r ded, in o nd upp r by h ch i cupe apied, mem r W ns n o t r work-seating o ag n edge or rim 8.

p spes df r' moveme t W hi wy l nt rmed a it al 5 and end wallor adapter 3 and-adapted for attachment, as

shown, to the usual shiftable draw-bar 9 of the machine, is a follower-plate 10. At-

tached to this plate by means of an annular series of suitably elongated screws ll'proecting forwardly through wall 5 and bear ins: a 2, for s da emovement upon the inner face of body 1 forwardly of wall 5, is a Ping g l :v Suita y at ch to 1 1 61 a n he scre s 11- aga nst longitudinal movement. Attached, in turn,

e r es 1,3 'by w 0 th lik 15 a extending forwardly of body 1, is a jaw-engaging ring-member 16; hav ng inwardly qr re rw r ly p e t d. cam-face 3 6 i te v P0$ QI1d an retain d W hin the body 1 forwardly of all= 5 and; supported upon thescrews 11, isan annular jaw e n e e compr s ng conce ved ring 17 and a econd, ring 18 having'a; G r fcumfe ential groove upon itsouter perimeter, the ring 17 being formed with peripheral recesses 19 for accommodating and seating upon the shanksofthe screws 11. Rings 17 and 18 provide an annular pivot or journal seat for the correspondingly arcuated rear ends 20 of a plurality of separate or lndependent suitably elongated shanks or stems 21, each provided at itsfonwardend with a head orjaw proper 22 laterally proecting inwardly relatively to the body 1. The several awshanks 21 lengthwise extend forwardly inbody 1, and the severalv heads 22, whichi are disposed in an. annular series forwardly ofand about cup; 7, are adapted for worleholding or engaging co-operatjion,

at,theirrrearwardly presented faces 23, with the rim of cup 7. As. best seen in Figure 1, the outer wall of the concaved faceof ring 17 is su tably cut-away, whereby the several jaws 22 have certain freedom for independjaws 22 thereby maintained in proper swingable relation to one another and to the cup 7.

The several jaws 22 are each formed or provided with a front or forwardly presented face including a belveled or cam-portion 26 adapted for engagement by and co-operation with the cam-face 16 of the ring 16, the several jaws 22 being yieldingly held in radially expanded spaced relation out of engagement with the cup 7 and outwardly from the center or axis of body 1 by means of a suitable annular spring 27 disposed therewithin and engaging the shanks 21 thereof as best seen in Figure 1. As will be noted, the ring 16 has but limited shift-able movement, and hence it will be evident that the jaw-engaging or cam-ring 16 functions also to retain the series of jaws 22 and the shank engaging rings 17 18, operatively within the chamber of the body 1.

I have heretofore employed my new chuck in the machining and turning of engine piston or packing-rings. For such use, the chuck is especially adapted, and, as an application of the chuck, I have illustrated the same in that relation.

In operation, assume the annular series of jaws 22 and their co-operating contracting member or ring 16 to be in so-called normal or non-work engaging position or in the position thereof illustrated in dotted lines in Figure 1. A packing or piston-ring 28 to be machined is now suitably placed upon the rim 8 of cup 7. With ring 28 so positioned, the draw bar 9 and consequently also its attached followenplate l and cam-ring 16 are shifted rearwardly, when, under the cam-engagement between the face 16' -of the cam-member or ring 16 and the forwardly presented faces 26 of the several jaws 22, the several jaws 22 are radially hingedly or pivotally contracted against the tension of their expanding spring 27 into the position thereof illustrated in full lines in Figure 1 to engage the ring 28 at their rearwardly presented faces 23, the ring 28 to be machined being thereby firmly and rigidly gripped and held by and between the cup 7 and the series of aws 22. Operations upon the ring 28 being completed. bar 9 and its attached jaw-contracting member or ring 16 are likewise oppositely or forwardly shifted, whereupon, under the tension of spring 27, the several jaws 22 are yieldingly radial ly spread outwardly or expanded to nonwork engaging or normal position or again into the position thereof illustrated in dotted lines in Figure 1, the finished ring 28 being released and suitably removed from the machine.

My new chuck in its several parts may be economically produced, is applicable for use in connection with, and may be conveniently installed upon, practically all forms or types of turning machines, and is exceedingly precise, accurate, and efficient in the performance of its intended functions.

It will be readly understood that changes in the size, form, construction, arrangement, and combination of the variousparts of my new chuck may be made and substituted for those herein shown and described without departing from the nature and principle of my invention.

Having thus described my invention, what I claim and desire to secure by Letters Patent is: r

1. A. chuck including, in combination, a chambered body. a work-engaging member rigidly supported by and disposed within the body, a follower plate disposed for axial movement within the chamber of the body, a rin -shaped member disposed axially *ithin the chamber of the body forwardly of the follower plate, a plurality of jaws each comprising a shank pivotally mounted at an end in the ring-shaped member and a head laterally projecting inwardly from the shank and having opposite faces forwardly and rearwardly presented relatively to the work-engaging member, the jaws being normally disposed in a yieldingly expanded series about, and with their heads presented forwardly of, the work-engaging member,

elongated screw-members disposed longitudinally within the chamber of the body and fixed at an end in the follower plate and a cam ring disposed forwardly of the jawheads and attached to said screws, the ringmember being seated upon said screw-memhers, and said cam-member being adapted, on shiftable movement of the follower plate, for engagement with the jaws at the for wardly presented faces of their heads for radially contracting the jaws to engage the work at the opposite rearwardly presented faces of their headsin co-operation with the work-engaging member.

2. A chuck including a cylindrical body having an inwardly presented work-seat, and an annular series of jaws disposed within the body for work-engaging co-operation with the seat, in combination with means for pivotally supporting the jaws for swingable actuation. said means including a pair of juxtaposed rings disposed within said body and having oppositely disposed arcuate faces. shanks on the jaws extending lengthwise within the body, arcuate heads on the inner enns of said aws fitting intermediate the arcuate faces of the rings, and pins engaging the rings for securing the same together and in engaging relation with said heads.

A chuck including a cylindrical body having an inwardly presented work-seat, and an annular series of jaws disposed within the body for work-engaging co-operation with the seat, in combination with means for pivotally supporting the jaws for independent swingab'e actuation, said means including a pair of juxtaposed rings disposed Within said body, one of said rings having a circumferential concave face and the other of said rings having anopposed circumferential groove, shankson the jaws extending lengthwise Within the body, 'arcuate heads on the inner ends of said shanks fitting ingaging the rings for securing the same to gether and in engaging relation with said heads and lateral stubs on said heads for spacing the one from the other.

. In testimony whereof, I have signed my name to this specification.

LOUIS A. EDELMANN 

